Double Free in libx11 - CVE-2020-14363

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Main Vulnerability Database Vulnerabilities #VU46027

Double Free in libx11 - CVE-2020-14363

Published: August 25, 2020


Vulnerability identifier: #VU46027
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-14363
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error when handling locales in LibX11. A local user can run a specially crafted program to trigger integer overflow and double free and execute arbitrary code on the system with elevated privileges.


Affected software

libx11
Data Computing Appliance (DCA)
Amazon Linux AMI
Gentoo Linux
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Scientific Computing
CentOS
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Ubuntu
Opensuse
openEuler
Fedora
libx11 (Alpine package)
libX11 (Red Hat package)
egl-wayland (Red Hat package)
libglvnd (Red Hat package)
libx11-6 (Ubuntu package)
libwacom (Red Hat package)
libX11
libX11-debugsource
libX11-help
libX11-debuginfo
libX11-devel
libinput (Red Hat package)
xorg-x11-server (Red Hat package)
libdrm (Red Hat package)
xorg-x11-drivers (Red Hat package)
mesa (Red Hat package)
Cloud Pak for Security (CP4S)
OpenShift Virtualization
Red Hat OpenShift Container Platform

How to mitigate CVE-2020-14363

Install updates from vendor's website.

libx11 - update to 1.6.12
libx11 (Alpine package) - update to 1.6.12-r0
libX11 (Red Hat package) - addressed in versions 1.6.4-4.el6_10, 1.6.7-3.el7_9, 1.6.8-4.el8
Cloud Pak for Security (CP4S) - update to 1.8.0.0
egl-wayland (Red Hat package) - update to 1.1.5-3.el8
libglvnd (Red Hat package) - update to 1.3.2-1.el8
libx11-6 (Ubuntu package) - addressed in versions 2:1.4.99.1-0ubuntu2.5, 2:1.6.2-1ubuntu2.1+esm1, 2:1.6.3-1ubuntu2.2, 2:1.6.4-3ubuntu0.3, 2:1.6.9-2ubuntu1.1
libwacom (Red Hat package) - update to 1.6-2.el8
libX11 - update to 1.6.9-4
libX11-debugsource - update to 1.6.9-4
libX11-help - update to 1.6.9-4
libX11-debuginfo - update to 1.6.9-4
libX11-devel - update to 1.6.9-4
libX11 - addressed in versions 1.6.12-1.fc31, 1.6.12-1.fc32, 1.6.12-1.fc33
libinput (Red Hat package) - update to 1.16.3-1.el8
xorg-x11-server (Red Hat package) - update to 1.20.10-1.el8
libdrm (Red Hat package) - update to 2.4.103-1.el8
OpenShift Virtualization - addressed in versions 2.6.6, 4.8.0
Data Computing Appliance (DCA) - update to 4.3.0.0
Red Hat OpenShift Container Platform - update to 4.5.20
xorg-x11-drivers (Red Hat package) - update to 7.7-30.el8
mesa (Red Hat package) - update to 20.3.3-2.el8

External References

Related Security Bulletins